大跨度公轨两用悬索桥风_车_桥耦合振动及抗风行车准则研究大跨度公轨两用悬索桥风_车_桥耦合振动及抗风行车准则研究.pdf

第 29 卷第 12 期 Vol.29 No.12 工 程 力 学 2012 年 12 月 Dec. 2012 ENGINEERING MECHANICS 114 文章编号：1000-4750(2012)12-0114-07 大跨度公轨两用悬索桥风-车-桥耦合振动及 抗风行车准则研究 李永乐 1，董世赋 1，臧 瑜 2，强士中 1 (1. 西南交通大学桥梁工程系，四川，成都 610031；2. 上海市政工程设计研究总院，上海 200092) 摘 要：将风、车、桥三者作为一个交互作用、协调工作的耦合动力系统，基于风-车-桥系统空间耦合分析模型， 以一大跨度公轨两用悬索桥为例，采用自主研发的桥梁结构分析软件 BANSYS(Bridge Analysis System)分析了风 荷载作用下桥梁和车辆的动力响应，讨论了风速、车速及轨道交通布置方式等因素的影响；同时，基于合理的列 车运行安全性和舒适性评价指标，对列车通过该桥时的走行安全性与舒适性进行了分析，得出了该悬索桥的抗风 行车准则：当风速小于 20m/s 时，车速可达设计车速 80km/h；当风速介于 20m/s 和 25m/s 之间时，车速不能大于 60km/h；当风速大于 25m/s 时，应封闭轨道交通。 关键词：风-车-桥系统；耦合振动；抗风行车准则；风荷载；悬索桥 中图分类号：U448.25 文献标志码：A doi: 10.6052/j.issn.1000-4750.2011.03.0158 COUPLING VIBRATION OF WIND-VEHICLE-BRIDGE SYSTEM FOR LONG-SPAN ROAD-RAIL SUSPENSION BRIDGE AND RESISTANT-WIND CRITERION OF RUNNING TRAIN LI Yong-le1 , DONG Shi-fu1 , ZANG Yu2 , QIANG Shi-zhong1 (1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China) Abstract: Wind, vehicle and bridge can be regarded as a coupled vibration system. Based on the novel three-dimensional dynamic model of the wind-vehicle-bridge system, the dynamic responses of vehicles and bridge of a long-span road-rail suspension bridge under wind action were analyzed to demonstrate the effects of wind speed, vehicle speed and the layout of track system using the self-developed software, BANSYS (Bridge Analysis System). Based on the reasonable assessment index, the train running safety and passenger riding comfort across the bridge were studied and the resistant-wind criterion of running train was ob